UPD70433GD-16-5BB NEC [NEC], UPD70433GD-16-5BB Datasheet - Page 11

• Manufacturer Part Number: UPD70433GD-16-5BB
• Description: V55PITM 16-BIT MICROPROCESSOR
• Manufacturer: NEC [NEC]

1.1.2
ASTB
RD
WRL
WRH
READY
DEX
RAS
D8/D16
BUSLOCK
POLL
HLDRQ
HLDAK
REFRQ
AD0 to AD15
A16 to A23
IORD
IOWR
DMARQ0
DMARQ1
DMAAK0
DMAAK1
TCE0
TCE1
(1)
Pin Name
Non-Port Pins
Bus control pins
input/output
3–state
3–state
Output
Output
Output
Output
Output
Output
Output
output
Input/
Input
Input
Input
Input
External bus cycle address strobe signal output in external bus
External memory cycle data read strobe signal output in
external bus
External memory cycle lower byte data write strobe signal
output in external bus
External memory cycle upper byte data write strobe signal
output in external bus
External bus cycle ready signal input in external bus
External bus cycle upper byte data enable signal output
DRAM low address latch timing signal output
External bus data bus width selection signal input
External bus bus lock signal output
Input of POLL signal (sampled in POLL instruction execution)
External bus hold request signal input
External bus hold acknowledge signal output
Refresh pulse signal output
External bus cycle address/data multiplex signal input/output
in external bus
External bus cycle address signal output in external bus
External I/O cycle data read strobe signal output
External I/O cycle data write strobe signal output
DMA request signal input (channel 0)
DMA request signal input (channel 1)
DMA acknowledge signal output (channel 0)
DMA acknowledge signal output (channel 1)
DMA termination signal output (channel 0)
DMA termination signal output (channel 1)
Function
P80
P81
Alternate
Function
PD70433
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